1543401972 has 48 divisors (see below), whose sum is σ = 4573045120. Its totient is φ = 440971776.

The previous prime is 1543401961. The next prime is 1543402009. The reversal of 1543401972 is 2791043451.

1543401972 is a `hidden beast` number, since 1 + 543 + 40 + 1 + 9 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1020013 + ... + 1021524.

Almost surely, 2^1543401972 is an apocalyptic number.

1543401972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1543401972 is an abundant number, since it is smaller than the sum of its proper divisors (3029643148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1543401972 is a wasteful number, since it uses less digits than its factorization.

1543401972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2041557 (or 2041549 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 1543401972 is about 39286.1549658401. The cubic root of 1543401972 is about 1155.6500708866.

The spelling of 1543401972 in words is "one billion, five hundred forty-three million, four hundred one thousand, nine hundred seventy-two".